Using python to replace subtypes with descriptions

I have a workflow that wil use a definition query to select a subset of point data that will be exported from SDE to a 3rd party. One of the attributes is a subtype where there are 14 subtypes. When I export the data, the subtype remains as a number rather than a description. What I need to do is come up with a python expression to replace all of the different subtype numbers with the descriptions. I have found where I can replace subtype with the description, but how do I do all of them at once?

What is the field type? If it's numeric (since you mention number), you can't put a string into it. Otherwise, I don't think you can run a multiple replace in one line like that; at least, I've never seen it.

Assuming this is in Field Calculator, set the parser to Python and check Show Codeblock. In Pre-Logic Script Code, enter something like: